Check out
www.electroseller.com. Lots of aluminum cases and not expensive. You can even order them with as many fans as you like pre-installed. Else, try
www.nexfan.com for your fans. Great shop and a lot of good advice. I picked up a SkyHawk aluminum tower with 400W aluminum PS for $69.99 including shipping. For some cases, they even have the side panel with built-in window for $19. With all the fans (including a blowhole I installed), I run about 25-27C case temp.